Hello,
I believe your hip and back pain is coincidental. Does the pain also radiate down your leg? If so, this could very well be sciatica. Another consideration is bursitis.
Here is some info:
http://www.mayoclinic.com/health/bursitis/DS00032/DSECTION=2
http://www.mayoclinic.com/health/sciatica/DS00516
The spotting may be due to a hormonal imbalance. Often, there is no explanation and next month your period could return to normal. Often, stress, diet and exercise can affect your cycle. Another consideration is that you may be experiencing the first signs of perimeopause. I would suggest dicussing this with your GYN, especially if the spotting continues over the course of the next week.
http://www.mayoclinic.com/health/perimenopause/DS00554
Please let me know if you have questions.
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